Reacción #2286300

Ecuación de reacción

sodium acetate

N-[3,5-dichloro-4-(6-chloro-5-isopropyl-pyridazin-3-yloxy)-phenyl]-oxalamic acid

N-[3,5-Dichloro-4-(6-chloro-5-isopropyl-pyridazin-3-yloxy)-phenyl]-oxalamic acid

→

N-[3,5-dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-yloxy)-phenyl]-oxalamic acid

Rendimiento 56.1%

N-[3,5-Dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-yloxy)-phenyl]-oxalamic acid

Rendimiento 56.1%

Disolventes

acetic acid

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe reaction mixture was cooled to room temperature
2. 2
   Concentraciónwas concentrated under vacuum
3. 3
   workup.ADDITIONThe resulting solid was diluted with water (50 mL)
4. 4
   workup.ADDITIONThe mixture was made acidic to pH=3 by the addition of glacial acetic acid
5. 5
   FiltraciónThe solids were filtered
6. 6
   Lavadorinsed well with water
7. 7
   Otrodried on the funnel
8. 8
   Temperaturamethyl tert-butyl ether: hexanes (3 mL) and then was heated to reflux
9. 9
   TemperaturaThe mixture was cooled
10. 10
    Filtraciónfiltered
11. 11
    Filtraciónfiltered
12. 12
    OtroThe resulting pure solid was dried under high vacuum for 24 h
13. 13
    Otrodried in a vacuum oven at 80° C. for 24 h

Procedimiento

A mixture of glacial acetic acid (55 mL), sodium acetate (1.2 g, 14.7 mmol) and N-[3,5-dichloro-4-(6-chloro-5-isopropyl-pyridazin-3-yloxy)-phenyl]-oxalamic acid (28) (1.7 g, 4.2 mmol) was heated to 100° C. for 24 h. The reaction mixture was cooled to room temperature and was concentrated under vacuum. The resulting solid was diluted with water (50 mL). The mixture was made acidic to pH=3 by the addition of glacial acetic acid. The solids were filtered and rinsed well with water and dried on the funnel. The solid was slurried in 1:1:2 isopropyl acetate: methyl tert-butyl ether: hexanes (3 mL) and then was heated to reflux. The mixture was cooled and filtered. A slight amount of impurity was detected by TLC. The solid was slurried in isopropyl acetate (10 mL) and filtered. The resulting pure solid was dried under high vacuum for 24 h and then dried in a vacuum oven at 80° C. for 24 h to afford N-[3,5-dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-yloxy)-phenyl]-oxalamic acid (29) (0.91 g, 56%) as a white solid; EI(+)-HRMS m/z calcd for C15H13Cl2N3O5 (M+H) 386.0305, found 386.0308. Molecular Weight=386.1940; Exact Mass=385.0232

Fuente